Using or operated by energy derived from the sun, Of or pertaining to the sun; proceeding from the sun. See Solar system, below, a microscope consisting essentially, first, of a mirror for reflecting a beam of sunlight through the tube, which sometimes is fixed in a window shutter; secondly, of a condenser, or large lens, for converging the beam upon the object; and, thirdly, of a small lens, or magnifier, for throwing an enlarged image of the object at its focus upon a screen in a dark room or in a darkened box, noun_ obsolete A loft or upper chamber forming the private accommodation of the head of the household in a medieval hall; a garret room, obsolete A loft or upper chamber; a garret room